Calculating pinion and headspeed w/o tachometer

[nexus05]

Hi guys,

Just to share, here a way to calculate headspeed without tachometer and also no. of pinions on your motor

Heres the link

http://www.helitown.com/Downloadpagepipoinheadspeed.html

Ignore the part abt password thing..doesnt prompt me anything when i d/l..its a excel file, hope you guys find it useful.